EP0397897B1 - Kraftstoffeinspritzvorrichtung für Einspritzvergaser - Google Patents

Kraftstoffeinspritzvorrichtung für Einspritzvergaser Download PDF

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Publication number
EP0397897B1
EP0397897B1 EP19890108690 EP89108690A EP0397897B1 EP 0397897 B1 EP0397897 B1 EP 0397897B1 EP 19890108690 EP19890108690 EP 19890108690 EP 89108690 A EP89108690 A EP 89108690A EP 0397897 B1 EP0397897 B1 EP 0397897B1
Authority
EP
European Patent Office
Prior art keywords
fuel
chamber
fuel injection
diaphragm
throttle valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19890108690
Other languages
English (en)
French (fr)
Other versions
EP0397897A1 (de
Inventor
Mitsuru Sekiya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mikuni Corp
Original Assignee
Mikuni Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mikuni Corp filed Critical Mikuni Corp
Priority to DE8989108690T priority Critical patent/DE68900720D1/de
Priority to EP19890108690 priority patent/EP0397897B1/de
Publication of EP0397897A1 publication Critical patent/EP0397897A1/de
Application granted granted Critical
Publication of EP0397897B1 publication Critical patent/EP0397897B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/44—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by means for supplying extra fuel to the engine on sudden air throttle opening, e.g. at acceleration

Definitions

  • the present invention relates to a fuel injection system for injection carburetors adapted to control fuel injection rate on the basis of negative pressure produced depending on flow rate of air to be sucked into the suction tube.
  • the reference numeral 1 represents a suction tube and the reference numeral 2 designates a throttle valve arranged downstream a venturi 3 in the suction tube 1.
  • the reference numeral 4 represents a fuel control unit consisting of an air section of regulator 5 and a fuel section of regulator 6.
  • the reference numeral 7 represents a first diaphragm for dividing the air section of regulator into an atmosphere chamber 8 and a depression chamber 9, the reference numeral 10 designates a negative pressure passage designed as air flow rate metering means having an end communicated with the depression chamber 9 and the other end opened to the venturi 3 in the suction tube 1,
  • the reference numeral 11 denotes a second diaphragm for dividing the fuel section of regulator 6 into a fuel pressure chamber 12 and a fuel injection chamber 13
  • the reference numeral 12a represents a spring arranged in the fuel pressure chamber 12 so as to urge the first diaphragm 11 toward the fuel injection chamber 13
  • the reference numeral 13a designates a fuel injection port arranged in the fuel injection chamber 13 so as to be opposed to the second diaphragm 11
  • the reference numeral 14 denotes a fuel jet arranged in parallel to the second diaphragm 11 and designed as fuel metering means communicating the fuel pressure chamber 12 with the fuel injection chamber 13,
  • the reference numeral 15 represents a connecting
  • the reference numeral 16 represents a fuel injection passage having an end communicated with the fuel injection port 13a and the other end opened to the suction tube 1 at a location downstream the throttle valve 2.
  • the reference numeral 17 represents a fuel passage for communicating a fuel tank 18 with the fuel pressure chamber 12
  • the reference symbol P represents a fuel pump arranged in the course of the fuel passage 17 for pressurizing and feeding fuel into the fuel pressure chamber 12
  • the reference numeral 19 designates a regulator communicated with a fuel passage 17a branched at a location downstream the fuel pump P, said regulator 19 serving to adjust fuel pressure in the fuel passage 17 for controlling flow rate of the fuel flowing into the fuel pressure chamber 12 and return excessive fuel to the fuel tank 18 through a return passage 20.
  • this object is attained by equipping a fuel injection system with an air section of regulator comprising a depression chamber and an atmosphere chamber separated from each other by a first diaphragm, a fuel section of regulator comprising a fuel pressure chamber and a fuel injection chamber separated from each other by a second diaphragm and comprising a fuel jet communicating the fuel pressure chamber and fuel injection chamber with each other, a connecting member connected between the first diaphragm and the second diaphragm and having a fuel injection valve capable of opening and closing a fuel injection port, an acceleration fuel supply unit comprising an auxiliary fuel chamber and an atmosphere chamber separated from each other by a third diaphragm, said auxiliary fuel chamber being communicated with the fuel injection chamber, and interlock means for increasing or decreasing the volume of the auxiliary fuel chamber in accordance with increase or decrease of opening degree of a throttle valve.
  • a fuel is fed from the auxiliary fuel chamber into the fuel injection chamber the moment the volume of the fuel injection chamber is increased due to increase of a negative pressure at the acceleration time, and the fuel is sucked from the fuel injection chamber into the auxiliary fuel chamber the moment the volume of the fuel injection chamber is decreased due to decrease of a negative pressure at the deceleration time. Accordingly, variation of air-fuel ratio of the mixture is prevented in the transient condition during acceleration or deceleration.
  • the interlock means consist of a cam attached fixedly to the throttle shaft, and a lever having one end engaged with said cam and the other end engaged said third diaphragm.
  • the interlock means consist of a potentiometer outputting an electrical signal of a level corresponding to opening degree of the throttle valve, an electromagnetic plunger or stepping motor capable of displacing the third diaphragm, and a control circuit capable of controlling duty ratio of the electromagnetic plunger or rotating angle of the stepping motor in accordance with the output from the potentiometer.
  • the reference numeral 21 represents an acceleration chamber communicated with the fuel injection chamber 13 through a fuel feeding passage 22, the reference numeral 23 designates a diaphragm for dividing the interior of the acceleration chamber 21 into a fuel chamber 24 and an atomosphere chamber 25, the reference numeral 26 denotes a cam attached fixedly to a throttle valve shaft 2a, and the reference numeral 27 represents a link capable of swinging round a shaft 27a and equipped at one end with a pin 27b engaged with a cam surface 26a of the cam 26 and at the other end with a protrusion 27c engaged with the diaphragm 23 in the acceleration chamber 21.
  • the pin 27b When the throttle valve 2 is opened, the pin 27b is pushed by the cam 26 to turn the link 27 counterclockwise and the protrusion 27c pushes the diaphragm 23 to decrease the volume of the fuel chamber 24.
  • the link 27 turns clockwise to move downward the protrusion 27c which is pushing the diaphragm 23, whereby the diaphragm 23 diaplaces toward the atmosphere chamber 25 to increase the volume of the fuel chamber 24.
  • the link 27 is biased by a spring 28 so that the pin 27b is engaged with the cam surface 26a of the cam 26.
  • the fuel injection valve 15a of the connecting member 15 separates rapidly from the fuel injection port 13a and the second diaphragm 11 displaces remarkably upward (toward the fuel pressure chamber 12), whereby the fuel to be injected becomes temporarily insufficient in the quantity corresponding to the volume increased by the displacement of the second diaphragm 11 and the pressure is lowered in the fuel injection chamber 13, but on the other hand, the cam surface 26a of the cam 26 pushes the pin 27b downward in accordance with the rotation of the throttle valve 2, the link 27 is rotated counterclockwise round the shaft 27a and the protrusion 27c displaces the diaphragm 23 in the acceleration chamber 21 upward (toward the fuel chamber 24), thereby decreasing the volume of the fuel chamber 24.
  • the fuel in the fuel chamber 24 is fed into the fuel injection chamber 13 kept at a low pressure through the fuel passage 22.
  • the Embodiment 1 of the present invention can prevent the temporary variation of the air-fuel ratio of the mixture, i.e., the mixture lean phenomenon in the transient condition during acceleration.
  • the Embodiment 1 of the present invention can prevent the temporary variation of air-fuel ratio of the mixture, i.e., the mixture rich phenomenon in the transient condition during deceleration as described above.
  • the interlock means for varying the volume of the fuel chamber 24 of the acceleration chamber 21 in conjunction with the opening or closing of the throttle valve 2 is composed mechanically of the cam 26 and the link 27 in the Embodiment 1 described above, it is possible to compose the interlock means of electrical means, for example, so as to vary the volume of the fuel chamber 24 by detecting motion of the throttle valve 2 and electrically controlling an electromagnetic plunger or a stepping motor.
  • Fig. 4 illustrates the Embodiment 2 of the present invention wherein the volume of the fuel chamber 24 is varied by utilizing an electromagnetic plunger.
  • the reference numeral 29 represents a potentiometer for detecting opening degree of the throttle valve 2 and the reference numeral 30 designates a control circuit for controlling operation of the electromagnetic plunger 31 with input from the potentiometer 29.
  • a plunger 31a is raised for the maximum stroke by the electromagnetic plunger 31 which is energized by means of the potentiometer 29 and the control circuit 30, thereby displacing the diaphragm 23 fully upward.
  • the plunger 31a is returned to the position shown in Fig. 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)

Claims (3)

1. Kraftstoffeinspritzeinrichtung für Einspritzvergaser, bestehend aus einem Luftteil (5) einer Reguliervorrichtung, die eine Unterdruckkammer (9) und eine Atmosphärendruckkammer (8) enthält, die durch eine erste Membran (7) voneinander getrennt sind, einem Kraftstoffteil (6) einer Reguliervorrichtung, die eine Kraftstoffdruckkammer (12) und eine Kraftstoffeinspritzkammer (13) enthält, die voneinander durch eine zweite Membran (11) voneinander getrennt sind, sowie eine Kraftstoffdüse (14), die die genannte Kraftstoffdruckkammer (12) mit der genannten Kraftstoffeinspritzkammer (13) verbindet, einem die erste und die zweite Membran (7, 11) miteinander verbindenden Verbindungsorgan (15), das mit einem Kraftstoffeinspritzventil (15a) versehen ist, das in der Lage ist, eine in der genannten Kraftstoffeinspritzkammer (13) ausgebildete Kraftstoffeinspritzöffnung (13a) zu öffnen und zu schließen, einer Beschleunigungskraftstoffversorgungseinheit (21), die eine Zusatzkraftstoffkammer (24) und eine Atmosphärendruckkammer (25) enthält, die durch eine dritte Membran (23) voneinander getrennt sind, wobei die genannte Zusatzkraftstoffkammer (24) mit der genannten Kraftstoffeinspritzkammer (13) verbunden ist, und Einstellmittel zur Vergrößerung und Verkleinerung des Volumens der genannten Zusatzkraftstoffkammer (24) in Abhängigkeit von der Vergrößerung oder Verkleinerung des Öffnungsgrades einer Drosselklappe (2).
2. Kraftstoffeinspritzeinrichtung für Einspritzvergaser gemäß Patentanspruch 1, bei der die genannten Einstellmittel aus einer mit einer Drosselklappenwelle (2a) fest verbundenen Nockenscheibe (26) und einem Hebelorgan (27), dessen eines Ende mit der genannten Nockenscheibe (26) und dessen anderes Ende mit der genannten dritten Membran (23) in Eingriff ist, besteht.
3. Kraftstoffeinspritzeinrichtung für Einspritzvergaser gemäß Patentanspruch 1, bei der die genannten Einstellmittel aus elektrischen Mitteln bestehen, die in der Lage sind, elektrische Signale eines Betrages, der vom Öffnungsgrad der Drosselklappe (2) abhängt, abzugeben, aus elektromagnetischen Antriebsmitteln, die in der Lage sind, die genannte dritte Membran (23) zu bewegen. und einem Steuerschaltkreis (30), der in der Lage ist, die Betätigung der genannten elektromagnetischen Antriebsmittel in Abhängigkeit vom Ausgangssignal der genannten elektrischen Mittel zu steuern.
EP19890108690 1989-05-13 1989-05-13 Kraftstoffeinspritzvorrichtung für Einspritzvergaser Expired EP0397897B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8989108690T DE68900720D1 (de) 1989-05-13 1989-05-13 Kraftstoffeinspritzvorrichtung fuer einspritzvergaser.
EP19890108690 EP0397897B1 (de) 1989-05-13 1989-05-13 Kraftstoffeinspritzvorrichtung für Einspritzvergaser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19890108690 EP0397897B1 (de) 1989-05-13 1989-05-13 Kraftstoffeinspritzvorrichtung für Einspritzvergaser

Publications (2)

Publication Number Publication Date
EP0397897A1 EP0397897A1 (de) 1990-11-22
EP0397897B1 true EP0397897B1 (de) 1992-01-15

Family

ID=8201362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890108690 Expired EP0397897B1 (de) 1989-05-13 1989-05-13 Kraftstoffeinspritzvorrichtung für Einspritzvergaser

Country Status (2)

Country Link
EP (1) EP0397897B1 (de)
DE (1) DE68900720D1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540735A (en) * 1945-06-29 1951-02-06 Niles Bement Pond Co Carburetor
US2641237A (en) * 1946-06-11 1953-06-09 Bendix Aviat Corp Engine fuel control
US3026860A (en) * 1958-07-30 1962-03-27 Chrysler Corp Fuel injection system
US2985160A (en) * 1959-03-02 1961-05-23 Acf Ind Inc Fuel injection system
DE1476227A1 (de) * 1964-04-07 1969-07-17 Loehner Dr Ing Kurt Vergasereinrichtung
SE318443B (de) * 1965-06-11 1969-12-08 Sibe

Also Published As

Publication number Publication date
DE68900720D1 (de) 1992-02-27
EP0397897A1 (de) 1990-11-22

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